Re: BGP multihoming question.

[Robert E. Seastrom]

"George Bonser"  writes:

>> -Original Message-
>> From: Bret Clark 
>> Sent: Friday, December 10, 2010 7:08 AM
>> To: nanog@nanog.org
>> Subject: Re: BGP multihoming question.
>> 
>> On 12/10/2010 10:01 AM, Dylan Ebner wrote:
>> > 3. You cannot trust the second isp to advertise the SWIP block
>> correctly if they are not a tier 1. Even though they may advertise it
>> for you to their upstream, they don't always have the appropriate
>> procedures in place to get the LOAs to the upstream so your block just
>> gets filtered out.
>> >
>> >
>> >
>> Just got done battling this exact issue with one of our upstream
>> peers...caused a lot of headaches for us.
>
> Proper registration in a routing registry helps, too.

As does, frankly, having an ISP with a clue...  and purported "tier"
has little to do with it.

-r

RE: BGP multihoming question.

[George Bonser]

> -Original Message-
> From: Bret Clark 
> Sent: Friday, December 10, 2010 7:08 AM
> To: nanog@nanog.org
> Subject: Re: BGP multihoming question.
> 
> On 12/10/2010 10:01 AM, Dylan Ebner wrote:
> > 3. You cannot trust the second isp to advertise the SWIP block
> correctly if they are not a tier 1. Even though they may advertise it
> for you to their upstream, they don't always have the appropriate
> procedures in place to get the LOAs to the upstream so your block just
> gets filtered out.
> >
> >
> >
> Just got done battling this exact issue with one of our upstream
> peers...caused a lot of headaches for us.

Proper registration in a routing registry helps, too.

Re: BGP multihoming question.

[Bret Clark]

On 12/10/2010 10:01 AM, Dylan Ebner wrote:

3. You cannot trust the second isp to advertise the SWIP block correctly if 
they are not a tier 1. Even though they may advertise it for you to their 
upstream, they don't always have the appropriate procedures in place to get the 
LOAs to the upstream so your block just gets filtered out.


   
Just got done battling this exact issue with one of our upstream 
peers...caused a lot of headaches for us.

RE: BGP multihoming question.

[Dylan Ebner]

Our organization does exactly this. The requirements we have run into are:

1. The block needs to be at least a /24 and registered with SWIP
2. You will need LOAs from the owner of the block. This used to take months to 
get, now it seems the isps have streamlined this operation
3. You cannot trust the second isp to advertise the SWIP block correctly if 
they are not a tier 1. Even though they may advertise it for you to their 
upstream, they don't always have the appropriate procedures in place to get the 
LOAs to the upstream so your block just gets filtered out. 

 

Dylan Ebner

-Original Message-
From: b2 [mailto:b...@playtime.bg] 
Sent: Thursday, December 09, 2010 5:32 AM
To: North American Network Operators Group
Subject: BGP multihoming question.

Hi , first sorry for lame question but i'm new to BGP.
In my ISP I have two full BGP sessions with my two transit providers (X and Y), 
and for every provider i have assigned PA (Provider
Aggregatable) networks. Is it possible (if there are no filters on other
side) to advertise X networks to Y and Y to accept them ? My confusion comes 
from the PA status , i know if it is PI there are no problem to route it to any 
AS. 
Thanks.

Re: BGP multihoming question.

[Jack Bates]

On 12/9/2010 5:32 AM, b2 wrote:

Hi , first sorry for lame question but i'm new to BGP.
In my ISP I have two full BGP sessions with my two transit providers (X
and Y), and for every provider i have assigned PA (Provider
Aggregatable) networks. Is it possible (if there are no filters on other
side) to advertise X networks to Y and Y to accept them ? My confusion
comes from the PA status , i know if it is PI there are no problem to
route it to any AS.
Thanks.



If it's SWIP'd to you by your provider, it is yours to use, and most 
providers will accept it. The difference between them is paperwork; 
that's all.



Jack

Re: BGP multihoming question.

[William Herrin]

2010/12/9 b2 :
> Hi , first sorry for lame question but i'm new to BGP.
> In my ISP I have two full BGP sessions with my two transit providers (X
> and Y), and for every provider i have assigned PA (Provider
> Aggregatable) networks. Is it possible (if there are no filters on other
> side) to advertise X networks to Y and Y to accept them ? My confusion
> comes from the PA status , i know if it is PI there are no problem to
> route it to any AS.

Generally speaking, you need at least a /24 from one or the other of
them, you need a letter of authorization (LOA) from the one that
provided the /24 permitting you to announce it to other ISP(s) and
you'll need to test to make sure the ISP who assigned the /24 has set
up their filters properly so that you can communicate with them over
the Internet even when your line to them is down.

For your first foray in to BGP, I strongly advise you to contract an
expert for help both programming your router and interacting with your
ISPs.

Regards,
Bill Herrin


-- 
William D. Herrin  her...@dirtside.com  b...@herrin.us
3005 Crane Dr. .. Web: 
Falls Church, VA 22042-3004

Re: BGP multihoming question.

[Gregory Edigarov]

On Thu, 09 Dec 2010 13:32:26 +0200
b2  wrote:

> Hi , first sorry for lame question but i'm new to BGP.
> In my ISP I have two full BGP sessions with my two transit providers
> (X and Y), and for every provider i have assigned PA (Provider
> Aggregatable) networks. Is it possible (if there are no filters on
> other side) to advertise X networks to Y and Y to accept them ? My
> confusion comes from the PA status , i know if it is PI there are no
> problem to route it to any AS. 

Basically I think you need to check with your providers whether they
will accept each other PA's


-- 
With best regards,
Gregory Edigarov


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BGP multihoming question.

[b2]

Hi , first sorry for lame question but i'm new to BGP.
In my ISP I have two full BGP sessions with my two transit providers (X
and Y), and for every provider i have assigned PA (Provider
Aggregatable) networks. Is it possible (if there are no filters on other
side) to advertise X networks to Y and Y to accept them ? My confusion
comes from the PA status , i know if it is PI there are no problem to
route it to any AS. 
Thanks.


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